Method and system for corrosion protection of layers in a structure of a magnetic recording transducer
View Patent ↗A method for providing a structure in a magnetic recording transducer is described. The method includes plating a first layer in a plating bath using a first plurality of plating conditions. The first layer has a first galvanic potential. The method also includes modifying the plating bath and/or the first plurality of plating conditions to provide a modified plating bath and/or a second plurality of plating conditions. The method further includes plating a second layer using the modified plating bath and/or the second plurality of plating conditions. The second layer has a second galvanic potential. The first galvanic potential is between the second galvanic potential and a third galvanic potential of a third layer if the third layer adjoins the first layer. The second galvanic potential is between the first galvanic potential and the third galvanic potential of the third layer if the third layer adjoins the second layer.
1. A method for providing a structure in a magnetic recording transducer comprising:
plating a first layer in a plating bath using a first plurality of plating conditions, the first layer having a first galvanic potential;
modifying at least one of the plating bath and the first plurality of plating conditions to provide at least one of a modified plating bath and a second plurality of plating conditions;
plating a second layer using the at least one of the modified plating bath and the second plurality of plating conditions so that either the first layer is between the second layer and a third layer such that the second layer does not directly contact the third layer or the second layer is between the first layer and the third layer such that the first layer does not directly contact the third layer, the at least one of the modified plating bath and the second plurality of plating conditions being selected such that the second layer has a second galvanic potential;
wherein if the first layer is between the second layer and the third layer then the first galvanic potential is between the second galvanic potential and a third galvanic potential of the third layer such that the second layer is less likely to corrode than if the second layer directly contacted the third layer; and
wherein if the second layer is between the first layer and the third layer then the second galvanic potential is between the first galvanic potential and the third galvanic potential of the third layer such that the first layer is less likely to corrode than if the first layer directly contacted the third layer;
wherein the third layer is an ambient layer.
2. The method of claim 1 wherein the first layer is a Ni 1-x Fe x layer and the second layer is a Ni 1-y Fe y layer, where x is at least 0.5 and not more than 0.95 and y is at least 0.18 and not more than 0.75.
3. The method of claim 1 wherein the plurality of plating conditions include a plating current and wherein the step of modifying the at least one of the plating bath and the first plurality of plating conditions further includes:
providing a step modulation change in the plating current.